Door threshold



FIG. 1 is an isometric view of a door threshold design of the invention.

FIG. 2 is a top view of a door threshold design of the invention.

FIG. 3 is a side view of a door threshold design of the invention; and,

FIG. 4 is a bottom view of a door threshold design of the invention. 

The ornamental design for a door threshold, as shown and described. 